最佳答案
回答者:网友
O(C([H])([H])[H])C1C([H])=C(C([H])=C(C=1[H])C([H])([H])C([H])([H])C1C([H])=C([H])C(=C(C=1[H])O[H])OC([H])([H])[H])O[H]